**THIS AIRCRAFT LEASE AGREEMENT** (the “Agreement”) is entered into this 2nd day of October,
2007, between, Capitaline Flight Services, LLC a South Dakota limited liability company, with its
principal office in Brookings, South Dakota (“Lessor”); and US BioEnergy Corporation, a South
Dakota corporation, with its principal office in Inver Grove Heights, Minnesota (“Lessee”).

     WHEREAS, Lessor wishes to lease on an hourly basis its Cessna T206H Turbo Stationair, Nav III,
Manufacturer’s Serial Number T20608758, Federal Aviation Administration (“FAA”) Registration Mark
N2451A, and the appliances, communications equipment, accessories, instruments and other items of
equipment installed thereon (the “Aircraft’) to Lessee, and Lessee wishes to lease the Aircraft
from Lessor;

     NOW, THEREFORE, in consideration of and subject to the terms and conditions herein, Lessor and
Lessee agree as follows:

**1. LEASE; TERM**

     a. Effective Date. This Agreement is effective as of September 20, 2007.

     b. Lease Term. Lessee hereby agrees to lease the Aircraft on a non-exclusive hourly
basis from Lessor, and Lessor hereby agrees lo lease the Aircraft to Lessee, pursuant to the terns
and conditions in this Agreement. Lessor reserves the right of use of the Aircraft by Lessor or
other lessees of the Aircraft. This Agreement shall commence on the first date written above and
continue in full force until terminated by either party upon 30 day’s prior written notice or
earlier pursuant to Section 7, below.